Communication between Android processes--AIDL detailed tutorial, taking passing objects as an example, two app implementations

我这里案例是 通过 IPC 传递对象 （以DemoBean类为例）

• as follows:

AIDL uses a simple syntax that allows you to declare an interface with one or more methods that can receive parameters and return values. Parameters and return values ​​can be of any type, even other interfaces generated by AIDL.

AIDL supports the following data types:

Usage details

• Take the following two apps as examples:
  

aidlapplication2（服务端）中的代码实现

• 1. Create DemoInterface.aidl
  
• 2. Create a DemoBean class

The class must support the Parcelable interface. Support for the Parcelable interface is important because it enables the Android system to decompose objects into primitives that can be marshaled into individual processes.

public class DemoBean implements Parcelable {
    
    
    private String name;
    private int age;

    public String getName() {
    
    
        return name;
    }

    public void setName(String name) {
    
    
        this.name = name;
    }

    public int getAge() {
    
    
        return age;
    }

    public void setAge(int age) {
    
    
        this.age = age;
    }

    public DemoBean(String name, int age) {
    
    
        this.name = name;
        this.age = age;
    }
    protected DemoBean(Parcel in) {
    
    
        name = in.readString();
        age = in.readInt();
    }

    public static final Creator<DemoBean> CREATOR = new Creator<DemoBean>() {
    
    
        @Override
        public DemoBean createFromParcel(Parcel in) {
    
    
            return new DemoBean(in);
        }

        @Override
        public DemoBean[] newArray(int size) {
    
    
            return new DemoBean[size];
        }
    };

    @Override
    public int describeContents() {
    
    
        return 0;
    }

    @Override
    public void writeToParcel(@NonNull Parcel parcel, int i) {
    
    
        parcel.writeString(name);
        parcel.writeInt(age);
    }
}

• 3. Create a method in DemoInterface.aidl - - I wrote two here, one for writing and one for getting

parcelable DemoBean; 导包需要手写，注意这里面是没有提示的！！！
parcelable 的 p是小写
写完方法后别忘了 Rebuild project 重新编译一下项目！！！

// DemoInterface.aidl
package com.example.aidlapplication2;
parcelable DemoBean;
// Declare any non-default types here with import statements

interface DemoInterface {
    
    
    /**
     * Demonstrates some basic types that you can use as parameters
     * and return values in AIDL.
     */
     void setDemoBean(in DemoBean demoBean);
     DemoBean getDemoBean();
}

• 4. Create a server-side DemoService

public class DemoService extends Service {
    
    
    @Nullable
    @Override
    public IBinder onBind(Intent intent) {
    
    
        return binder;
    }
    private DemoInterface.Stub binder=new DemoInterface.Stub(){
    
    
        private DemoBean demoBean;
        @Override
        public void setDemoBean(DemoBean demoBean) throws RemoteException {
    
    
            Log.e("TAG","测试名字---"+demoBean.getName());
            this.demoBean=demoBean;
        }
        @Override
        public DemoBean getDemoBean() throws RemoteException {
    
    
            return demoBean;
        }
    };
}

• 5. Start the service
  

aidlapplication1（客户端）中的代码实现

• 1. Copy DemoInterface.aidl directly, the package name and contents of DemoInterface.aidl must be the same
  
• 2. Here I gave three click events
  

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity">
    <Button
        android:onClick="btn0"
        android:text="绑定服务"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        />
    <Button
        android:onClick="btn1"
        android:text="get"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        />
    <Button
        android:onClick="btn2"
        android:text="set"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        />
</LinearLayout>

• 3. Processing of MainActivity

public class MainActivity extends AppCompatActivity {
    
    
    private DemoServiceConnection demoServiceConnection;
    private DemoInterface demoInterface;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
    
    
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }
    private class DemoServiceConnection implements ServiceConnection{
    
    
        @Override
        public void onServiceConnected(ComponentName componentName, IBinder iBinder) {
    
    
            demoInterface=DemoInterface.Stub.asInterface(iBinder);
        }
        @Override
        public void onServiceDisconnected(ComponentName componentName) {
    
    
        }
    }
    //点击绑定服务
    public void btn0(View view){
    
    
        Intent intent=new Intent();
        intent.setAction("com.example.aidlapplication2.DemoService");
        intent.setPackage("com.example.aidlapplication2");//包名
        demoServiceConnection=new DemoServiceConnection();
        bindService(intent,demoServiceConnection,BIND_AUTO_CREATE);//绑定服务
    }
    //点击获取数据
    public void btn1(View view){
    
    
        try {
    
    
            DemoBean demoBean = demoInterface.getDemoBean();
            Log.e("TAG","get---"+demoBean.getName());
        } catch (RemoteException e) {
    
    
            throw new RuntimeException(e);
        }
    }
    //点击写入数据
    public void btn2(View view){
    
    
        try {
    
    
            demoInterface.setDemoBean(new DemoBean("花花",6));
        } catch (RemoteException e) {
    
    
            throw new RuntimeException(e);
        }
    }

}